The Official Definitive Guide to Item Builds as an
AD Carry

Build A (Standard AD Carry such as Graves):Starting Items:-Flask-5 Red Potions-2 Blue PotionsIf you have never tried this starting build go do it right now. You effectively have an extra 1050 health and 320 mana. This allows you to stay in lane longer than any other build, which means you will be getting your BF Sword faster than your opponent.

First Back:-BF Sword-Boots of Speed-More Potions/Wards as neededThis is an ideal first back, you want to be able to get that BF Sword along with your tier one boots. This allows you to be a monster in lane, regardless of the opponent. You deal damage and have the ability to stick on almost anyone long enough to get a kill now.

First Big Item:If you are winning: The BloodthirsterThis allows you to snowball as you already have a completed item significantly faster than your opponent.If you are losing: Infinity EdgeYou need to shoot for being that power house late game if you lost the early. The only way to do that is to go for that Infinity Edge. Anything else will put you behind.

Second Big Item:If you are winning: Statikk ShivIf you are losing: Phantom DancerBasically, you are going to want one of these two items after your BF item. Statikk Shiv is cheaper, and it allows you to continue that snowball as you get it faster. Phantom Dancer is better for the late game, playing catchup build.

End Game Items (all situational, read to know when to get them):-Infinity EdgeIf you didn't get it already, you need it now. You are ahead, and you have to keep it that way.

-The BloodthirsterNeed more damage and you didn't get this earlier? Buy.

-Last WhisperIs there a Taric on the other team? Do you need to fill your 6th item slot? Does the enemy team have a significant amount of armor? If you said yes to any of these, get this item.

-Phantom Dancer/Statikk ShivIf you don't feel that you need a defensive item, it's not a bad call to get the one of these you didn't get earlier.

-Guardian AngelIf you are your team's only damage, get this so you can keep alive to murder the other team.

-Mercurial ScimitarIf there is any significant CC on the other team that you cannot avoid such as Warwick Ultimate, Malzahar Ultimate, or anything else that will be targeted onto you, get this to keep alive.